Slipper sock



FIG. 1 is a front, left side, top perspective view of a slipper sock showing my new design;

FIG. 2 is a rear, right side, bottom perspective view thereof,

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a front elevational view thereof; and,

FIG. 8 is a rear elevational view thereof.

The broken lines depict portions of the slipper sock that form no part of the claimed design. 

CLAIM The ornamental design for a slipper sock, as shown and described. 